JAVA EE: Spring ResourceLoaderAware example | Spring Tutorial | Spring Framework

Wednesday, 29 August 2018

Spring ResourceLoaderAware example | Spring Tutorial | Spring Framework | Spring basics

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Spring ResourceLoaderAware example | Spring Tutorial | Spring Framework | Spring basics

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0%20http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ram.core</groupId>

    <artifactId>SpringDemo</artifactId>

    <packaging>jar</packaging>

    <version>1.0-SNAPSHOT</version>

    <name>SpringDemo</name>

    <url>http://maven.apache.org</url>

    <properties>

        <spring.version>5.0.2.RELEASE</spring.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>3.8.1</version>

            <scope>test</scope>

        </dependency>

        <!-- Spring 5 dependencies -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>${spring.version}</version>

        </dependency>

    </dependencies>

     <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>3.7.0</version>

                <configuration>

                    <source>1.8</source>

                    <target>1.8</target>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

names.txt

Peter

Ram

Juli

ResourceLoaderAwareImpl.java

package com.ram.aware;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import org.springframework.context.ResourceLoaderAware;

import org.springframework.core.io.Resource;

import org.springframework.core.io.ResourceLoader;

public class ResourceLoaderAwareImpl implements ResourceLoaderAware

{

    private ResourceLoader resourceLoader;

    public void setResourceLoader(ResourceLoader resourceLoader)

    {

        System.out.println(

                "setResourceLoader(ResourceLoader resourceLoader) is called "

                        + "by the Spring Container");

        this.resourceLoader = resourceLoader;

    }

    public void displayFileInfo()

    {

        Resource resource = resourceLoader.getResource("classpath:names.txt");

        try (

                BufferedReader br = new BufferedReader(

                        new FileReader(resource.getFile().getPath())))

        {

            String thisLine = null;

            System.out.println("Names from the files are..");

            while ((thisLine = br.readLine()) != null)

            {

                System.out.println(thisLine);

            }

        }

        catch (FileNotFoundException e)

        {

            e.printStackTrace();

        }

        catch (IOException e)

        {

            e.printStackTrace();

        }

    }

}

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">

    <bean id="resourceLoaderAware" class="com.ram.aware.ResourceLoaderAwareImpl" />

</beans>

App.java

package com.ram.core;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ram.aware.ResourceLoaderAwareImpl;

public class App

{

    public static void main(String[] args)

    {

        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(

                "applicationContext.xml");

        ResourceLoaderAwareImpl resourceLoaderAwareImpl = applicationContext

                .getBean("resourceLoaderAware", ResourceLoaderAwareImpl.class);

        System.out.println("resourceLoaderAwareImpl = "+resourceLoaderAwareImpl);

        resourceLoaderAwareImpl.displayFileInfo();

        applicationContext.close();

    }

}

Output

Aug 13, 2018 9:46:49 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Mon Aug 13 09:46:49 IST 2018]; root of context hierarchy

Aug 13, 2018 9:46:49 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

setResourceLoader(ResourceLoader resourceLoader) is called by the Spring Container

resourceLoaderAwareImpl = com.ram.aware.ResourceLoaderAwareImpl@5c7fa833

Names from the files are..

Peter

Ram

Juli

Aug 13, 2018 9:46:50 AM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Mon Aug 13 09:46:49 IST 2018]; root of context hierarchy